CronOs - Can't access admin.cronos.htb

I could access admin.conos.htb for the first time. but after doing reverse shell on this machine. I couldn’t access admin.conos.htb domain.

I tried curl admin.conos.htb in terminal and it shows output. But I can’t access using browser. Browser says “Server not found. We can’t connect to the server at www.crontos.htb.”

What is my problem?